Map of C?te d'Ivoire showing the Sassandra River in the west part of the countryThe Sassandra River is a river of western C?te d'Ivoire in West Africa. It is formed by the confluence of the Tienba River, which originates in the highlands of northwestern C?te d'Ivoire, and the Gouan River (also known as the Bafing Sud River), which originates to the west in the highlands of Guinea.